<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        #dv{
            display: none;
        }
        p{
            width: 50px;
            height: 50px;
            border: 1px solid #ccc;
            
        }
        p:hover{
            background: red;
        }
    </style>
</head>
<body>
    <button onclick="btnshow()" id="btn">输入法</button>
      <div id="dv">
        <p>拼音</p>
        <p>汉字</p>
        <p>英文</p>
      </div>
      <script>
        var dvv=document.getElementById('dv')
        var bbtn=document.getElementById('btn')
         function btnshow() {
              dvv.style.display='block'
         }
      </script>
</body>
</html>